Graphics glitch on intel integrated graphics

Graphics and GPU Programming Programming

Started by scottrick49 June 24, 2009 07:13 AM

4 comments, last by swiftcoder 14 years, 10 months ago

455

Author

June 24, 2009 07:13 AM

Hi, I was testing my current project on some different machines to help ferret out problems, and I found one. Here's a picture of a satellite being rendered correctly on the debug screen in my project: rendered correctly All is well! However, as I zoom out more and more in game, I start to see artifacts on it! artifact! I have two other machines with a GeForce card and an ATI card and they do not have the problem. I feel like its a problem with the depth buffer, but I don't know why I wouldn't see it on the other machines as well. Or could it be a problem with the integrated Intel graphics?

scottrick49

Lord_Evil

682

June 24, 2009 08:12 AM

Looks like z-fighting indeed. What depth buffer precision does the app use with that Intel chip?

If I was helpful, feel free to rate me up ;)If I wasn't and you feel to rate me down, please let me know why!

scottrick49

455

Author

June 25, 2009 09:19 AM

Quote:What depth buffer precision does the app use with that Intel chip?

Not sure how to check this? I'm not changing any of the OpenGL setup / configuration based on the video card, or is this entirely card dependent?

scottrick49

zedz

291

June 25, 2009 02:04 PM

to see if it is zfighting (Im not 100% certain)
try gluPerspective( X,X, near *10.0, far );
i.e. make the near clipplane 10x larger

V-man

813

June 25, 2009 07:47 PM

Try glGetIntegerv to known the depth bits

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

swiftcoder

18,997

June 25, 2009 08:07 PM

Quote:Original post by scottrick49
Quote:What depth buffer precision does the app use with that Intel chip?
Not sure how to check this? I'm not changing any of the OpenGL setup / configuration based on the video card, or is this entirely card dependent?

You request a specific number of depth bits when you create the OpenGL context - thus the method varies depending on your windowing toolkit.

If you don't request a specific number of bits, the driver will pick a default, and the Intel driver may be defaulting lower than the ATI. The Intel card should support a higher bit depth though, so try requesting one. For instance, my Intel X3100 (on a Mac) supports both 16 and 24 bit depth, and appears to default to 16.

Tristam MacDonald. Ex-BigTech Software Engineer. Future farmer. [https://trist.am]

Graphics glitch on intel integrated graphics

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Graphics glitch on intel integrated graphics

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